Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4f2508efa1f12c…

MALICIOUS

PDF

69.0 KB Created: 2021-01-11 17:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 460bbf5983bcfe15dc1cf873915dc8c7 SHA-1: b83eff865b85518d9c3c4682755cb7f8bee36682 SHA-256: ef4f2508efa1f12c8f16602f3c1542c90c71e7bde15280da5a6d55b7f33eacad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/123?utm_term=levelquik+rs+sds PDF link annotation
    • https://site-1244472.mozfiles.com/files/1244472/89762957692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fe2c95453da6.pdfIn PDF document text
    • https://site-1195137.mozfiles.com/files/1195137/45485894165.pdfIn PDF document text
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/vomesavolifote.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdfIn PDF document text
    • https://site-1180826.mozfiles.com/files/1180826/game_of_warriors_apk_mod_hack.pdfIn PDF document text
    • https://junetinovifadi.weebly.com/uploads/1/3/0/9/130968968/situwilolejutafa.pdfIn PDF document text
    • https://vunivukakuxut.weebly.com/uploads/1/3/5/3/135301202/tibijazas-daraninutuv.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/zenumakoduwebug.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/dulixa.pdfIn PDF document text
    • https://site-1180586.mozfiles.com/files/1180586/medscape_cholesterol_guidelines.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/2990145.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/2581441.pdfIn PDF document text
    • https://febodume.weebly.com/uploads/1/3/2/8/132815732/3b52609f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 4800 bytes
SHA-256: 942035a52eb45df2517f2eb412db6b1f4271ee501d8c19b46d00d4ba44fcaab0
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 11588 bytes
SHA-256: f2da13946a76fcd0cc9016e75e7fe044781debf34756a52381ea3b739b81ada3

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